ashcroft



- hereby declare that the following is a full, clear, and exact description thereof.

@n itrh gum; gaunt.- {firs E. H. ASHCROFT, OF BOSTON, MASSACHUSETTS.

I Letters Patent No. 81,576, dated September 1, 1868.

IMPROVED uos-cosso'srvs VALVE-SEAT.

TO ALL WHOM I1 MAY Coronas:

Be it known that I, E. H. ASHCROFT, of Boston, in the county of Sufi'olk, and State of Massachusetts,- have I invented new and improved Non-Corrosive Compositions of Metals for Valves forSteam-Boilers; and I do The obj ect of my invention is to provide such metals or compositions of metals, tobcused in the manutaeture of safety-valves, or other valves for steam-boile rgas-will' not become corroded-by the action of water, steam, air, nor by any other action to which such valves. are exposed.

' It is well known to engineers,.and-others, that many-if not all of the safety-valves new in common use frequently become corroded' tesuch an extent that the valve'itself adheres to or is cemented to the seat so strongly that the whole object of such valves isdefeated, and great danger to life and property ensues.

Myinventionconsists in making these valves from the following non-eorrosive alloys or metals, any and all of which answer the purpose more or less perfectly:

First, an alloy of nickel and copper, free from zinc. Second, aluminum, alone or alloyed. I Third, an alloy of gold or silver.-

Fourth, combinations of theabove. I prefer, sometimes, to make the valve itself of one composition or metaL'ond the seat" of another, and,

in the choice of the metal to be used, am governed somewhat by the exposure to which the valve will probably be subjected.

I donet confine myself'to any exact proportions in casting these alloys, but, to enable others skilled in the art to'make use of the first one mentioned, will state that -I have found an alloy containing from twenty-five to fifty per cent. of'nickel, with from fifty to seventy-five per cent. of copper, (entirely free from zinc,) to be noncorrosivc, and admirably adapted to this purpose.- v I Having thus described my invention, I claim as new, and desire to secure by Letters-Patent- 1. An alloy of nickel and copper, in any proportions, as set forth, for the'construction of valvesor valveseats for steam, Ste.

2. An alloy of gold or silver, in any desired proportions, for the construction of valves or valve-seats for steam, for the purpose set forth.

.3. An alloy of aluminum, or aluminum alone, for the construction of valves or valve-seats for steam, for,

the purpose set forth.

, I E. H. ASHCROFT. Witnesses: i

CHARLES E. Asacaorr,-

EDWIN J. Ware nr. 

